after the fbi was contacted, and an investigation uncovered a sordid affair between petraeus and paula broadwell, there were early concerns that the cia director's secure government e-mails could have been hacked. but the probe never turned up evidence of national security being compromised. what it did find, as one source put it, was lots of human drama. key members of congress want to know why didn't they weren't told. >> we received no advance notice. it was like a lightning bolt. >> reporter: top intelligence officials were not informed until election day. the president was told the day after. >> the president should have been told about it at the earliest date. >> reporter: but a former fbi agent said the bureau followed protocol. >> the initial complaint was harassment. it possibly could have gone to e-mail hacking. but there was no substantive information that this had anything to do with national security. >> reporter: administration officials said the timing of the disclosure had nothing to do with politics, but congress is vowing to investigate, david. >> pierre thomas, thank